| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- ADA.CONTAINERS.UNBOUNDED_PRIORITY_QUEUES -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2011-2022, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- This unit was originally developed by Matthew J Heaney. -- |
| ------------------------------------------------------------------------------ |
| |
| package body Ada.Containers.Unbounded_Priority_Queues is |
| |
| protected body Queue is |
| |
| ----------------- |
| -- Current_Use -- |
| ----------------- |
| |
| function Current_Use return Count_Type is |
| begin |
| return Q_Elems.Length; |
| end Current_Use; |
| |
| ------------- |
| -- Dequeue -- |
| ------------- |
| |
| entry Dequeue (Element : out Queue_Interfaces.Element_Type) |
| when Q_Elems.Length > 0 |
| is |
| -- Grab the first item of the set, and remove it from the set |
| |
| C : constant Cursor := First (Q_Elems); |
| begin |
| Element := Sets.Element (C).Item; |
| Delete_First (Q_Elems); |
| end Dequeue; |
| |
| -------------------------------- |
| -- Dequeue_Only_High_Priority -- |
| -------------------------------- |
| |
| procedure Dequeue_Only_High_Priority |
| (At_Least : Queue_Priority; |
| Element : in out Queue_Interfaces.Element_Type; |
| Success : out Boolean) |
| is |
| -- Grab the first item. If it exists and has appropriate priority, |
| -- set Success to True, and remove that item. Otherwise, set Success |
| -- to False. |
| |
| C : constant Cursor := First (Q_Elems); |
| begin |
| Success := Has_Element (C) and then |
| not Before (At_Least, Get_Priority (Sets.Element (C).Item)); |
| |
| if Success then |
| Element := Sets.Element (C).Item; |
| Delete_First (Q_Elems); |
| end if; |
| end Dequeue_Only_High_Priority; |
| |
| ------------- |
| -- Enqueue -- |
| ------------- |
| |
| entry Enqueue (New_Item : Queue_Interfaces.Element_Type) when True is |
| begin |
| Insert (Q_Elems, (Next_Sequence_Number, New_Item)); |
| Next_Sequence_Number := Next_Sequence_Number + 1; |
| |
| -- If we reached a new high-water mark, increase Max_Length |
| |
| if Q_Elems.Length > Max_Length then |
| pragma Assert (Max_Length + 1 = Q_Elems.Length); |
| Max_Length := Q_Elems.Length; |
| end if; |
| end Enqueue; |
| |
| -------------- |
| -- Peak_Use -- |
| -------------- |
| |
| function Peak_Use return Count_Type is |
| begin |
| return Max_Length; |
| end Peak_Use; |
| |
| end Queue; |
| |
| end Ada.Containers.Unbounded_Priority_Queues; |
